Using Act ivated Carbon process and Membrane technology together, Permang anate Index w as cut of f to below 0. 5 mg/ L, A 254 w as low ered to 0. 01 below , the TOC of the eff luent w as about 700 μg/ L. 70 % of the conductance ratio, TDS and total alkalinity was removed by the NF and RO. 90 % of the total hardness w as removed. 90 % of the d-i valence and 70 % of the mono-valence ion w ere removed. More recovery rat io, more removal rat io. T he removal ability of the ESPA2 RO membrane is better than that of the ESNA1 NF membrane. The AOC of the ef fluent of the tw o kinds of membrane w as 60 and 47 μg/ L, w hich suggested that the biological stability is fairly good.